Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 288064 | Kilograms, contained selenium | NA |
| 2004 | 271073 | Kilograms, contained selenium | -5.90% |
| 2005 | 107000 | Kilograms, contained selenium | -60.53% |
| 2006 | 106000 | Kilograms, contained selenium | -0.93% |
| 2007 | 144000 | Kilograms, contained selenium | 35.85% |
| 2008 | 156000 | Kilograms, contained selenium | 8.33% |
| 2009 | 173000 | Kilograms, contained selenium | 10.90% |
